i dont use a dril, i use a handheld countersink tool as it can be much too easy to go too deep on carbon, and its really really annoying when you are nearly finished on your piece and the endstop slips on the pillar drill while countersinking............................
different makes of screw seem to have all sorts of different angles, my two hand tools match associated imperial and xray metric, but seeing as they are hand tools, others can be made to fit perfectly using deliberate innacuracy!! i always seal the holes with cyano afterwards to avoid splintering and delamination
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